EP 0720048 A3 19960724 -
Publication
Application
Priority
US 36665994 A 19941230
Abstract (en)
[origin: US5670306A] The invention provides a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a 1-aryl-2-pyrazolin-5-one coupler bearing a 4-aryloxy coupling-off group containing a group capable of releasing a photographically useful group (PUG) wherein: (1) the 1-aryl-2-pyrazolin-5-one ring contains a 3-cyano substituent or a substituent linked to the 3-position by an acyl group, thio group, sulfoxide group, sulfone group, or a tetrahedral carbon atom which tetrahedral carbon atom has bonded thereto three other atoms or substituent groups for which the sum of the sigma * values is at least 1.5; and (2) the 4-aryloxy coupling-off group: (a) contains ring substituents selected so that the sum of the Hammett's sigma constants for all substituents on the aryloxy ring is at least 0.3 but does not contain a nitro substituent in the position ortho to the oxygen atom bonded to the pyrazolone ring; and (b) contains (i) in at least one position ortho or para to the oxygen atom bonding the aryloxy group to the pyrazolone ring comprising a tetrahedral carbon atom bonded to a PUG or to another timing group which timing group is in turn bonded to a PUG directly or through a further timing group, or (ii) in a position ortho to the oxygen atom bonding the aryloxy group to the pyrazolone ring a carbamate group (with or without a methylene group bridge to the aryloxy ring) bonded to a PUG or to another timing group which timing group is in turn bonded to a PUG directly or through a further timing group; and provided that one or more of the aryloxy ring members or ring substituents may join to form one or more additional rings.
IPC 1-7
IPC 8 full level
G03C 7/305 (2006.01); G03C 7/384 (2006.01)
CPC (source: EP US)
G03C 7/30529 (2013.01 - EP US); G03C 7/384 (2013.01 - EP US); Y10S 430/156 (2013.01 - EP); Y10S 430/158 (2013.01 - EP)
Citation (search report)
- [A] BE 681457 A 19661031 & US 3419391 A 19681231 - YOUNG DAVID V
- [DA] US 4985336 A 19910115 - ICHIJIMA SEIJI [JP], et al
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL
DOCDB simple family (publication)
US 5670306 A 19970923; DE 69523429 D1 20011129; DE 69523429 T2 20020627; EP 0720048 A2 19960703; EP 0720048 A3 19960724; EP 0720048 B1 20011024; JP H08234386 A 19960913
DOCDB simple family (application)
US 73055896 A 19961015; DE 69523429 T 19951219; EP 95203565 A 19951219; JP 34161395 A 19951227